/*
 * Copyright 2007 Rob Nielsen
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * 	http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.googlecode.proxymatic.apps.factory.handlers;

import com.googlecode.proxymatic.apps.factory.Implementation;
import com.googlecode.proxymatic.apps.factory.ImplementationLookup;
import com.googlecode.proxymatic.core.BuildtimeContext;
import com.googlecode.proxymatic.core.MethodInvoker;
import com.googlecode.proxymatic.core.ProxyBuilder;
import com.googlecode.proxymatic.core.handlers.method.ConstructorMethodHandler;
import com.googlecode.proxymatic.core.util.ReflectUtil;

import java.lang.reflect.Method;

public abstract class BaseFactoryMethodHandler extends ConstructorMethodHandler {
    private final ImplementationLookup implementationLookup;

    public BaseFactoryMethodHandler(ImplementationLookup implementationLookup) {
        this.implementationLookup = implementationLookup;
    }

    public MethodInvoker getInvoker(Method method, BuildtimeContext context, ProxyBuilder proxyBuilder) {
        Class returnType = method.getReturnType();
        if (returnType.isPrimitive()) {
            return NOT_HANDLED;
        }
        Implementation annotation = method.getAnnotation(Implementation.class);
        if (annotation != null) {
            returnType = annotation.value();
        }
        if (returnType.isInterface() || ReflectUtil.isAbstract(returnType)) {
            returnType = implementationLookup.getImplementationClass(returnType);
        }
        return getInvoker(method, returnType, method.getParameterTypes());
    }

    protected abstract MethodInvoker getInvoker(Method method, Class returnType, Class<?>[] parameterTypes);
}
